<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box{
            width: 200px;
            height: 100px;
            background: orangered;
            text-align: center;
             background:/* linear-gradient(-135deg,transparent 15px,orangered 0)
            top right,
            linear-gradient(135deg, transparent 20px, orangered 0)
            top left,
            linear-gradient(-45deg,transparent 15px,orangered 0)
            bottom right,
            linear-gradient(45deg, transparent 20px, orangered 0)
            bottom left; */
            radial-gradient(circle at top left,  transparent 15px, #58a 0) top left,
            radial-gradient(circle at top right, transparent 15px, #58a 0) top right,
            radial-gradient(circle at bottom right,transparent 15px, #58a 0) bottom right,
            radial-gradient(circle at bottom left, transparent 15px, #58a 0) bottom left;
            color: white;    
            background-size: 50% 50%;
            background-repeat: no-repeat;
        }
    </style>
</head>
<body>
   <div class="box">
       hey,focus!
   </div> 
</body>
</html>